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Equity (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Stockholders' Equity Note [Abstract] |
Schedule of stock-based compensation expenses |
|  | Three Months Ended
|  | March 31,
|  |  | 2021 |  |  |  | 2020 |
|  | U.S $ in thousands
Cost of sales |  | $ | 634 |  |  | $ | 402 |
Research and development, net |  |  | 1,424 |  |  |  | 1,556 |
Selling, general and administrative |  |  | 5,147 |  |  |  | 2,949 |
Total stock-based compensation expenses |  | $ | 7,205 |  |  | $ | 4,907 |
Schedule of stock option activity |
|  |  | Number of Options |  |  |  | Weighted Average Exercise Price |
Options outstanding as of January 1, 2021 |  | $ | 2,102,529 |  |  | $ | 28.06 |
Granted |  |  | 46,366 |  |  |  | 3.15 |
Exercised |  |  | (137,220 | ) |  |  | 21.01 |
Forfeited |  |  | (13,439 | ) |  |  | 36.26 |
Options outstanding as of March 31, 2021 |  |  | 1,998,236 |  |  |  | 27.91 |
Options exercisable as of March 31, 2021 |  | $ | 1,619,049 |  |  | $ | 30.82 |
Schedule of RSUs and PSUs activity |
|  |  | Number of RSUs and PSUs |  |  |  | Weighted Average Grant Date Fair Value |
Unvested as of January 1, 2021 |  | $ | 2,801,116 |  |  | $ | 21.08 |
Granted |  |  | 1,201,186 |  |  |  | 34.62 |
Vested |  |  | (533,533 | ) |  |  | 22.56 |
Forfeited |  |  | (110,731 | ) |  |  | 20.69 |
Unvested as of March 31, 2021 |  | $ | 3,358,038 |  |  | $ | 25.70 |
Schedule of accumulated other comprehensive income (loss) |
|  | Three Months Ended March 31, 2021
|  |  | Net Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |  | Foreign Currency Translation Adjustments |  |  |  |  | Total |
|  | U.S. $ in thousands
Balance as of January 1, 2021 |  | $ | (1,673 | ) |  |  | $ | (7,173 | ) |  |  | $ | (8,846 | )
Other comprehensive income (loss) before reclassifications |  |  | 1,607 |  |  |  |  | (961 | ) |  |  |  | 646 |
Amounts reclassified from accumulated other comprehensive loss |  |  | 566 |  |  |  |  | - |  |  |  |  | 566 |
Other comprehensive income (loss) |  |  | 2,173 |  |  |  |  | (961 | ) |  |  |  | 1,212 |
Balance as of March 31, 2020 |  | $ | 500 |  |  |  | $ | (8,134 | ) |  |  | $ | (7,634 | )
|  | Three Months Ended March 31, 2020
|  |  | Net Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |  | Foreign Currency Translation Adjustments |  |  |  |  | Total |
|  | U.S. $ in thousands
Balance as of January 1, 2020 |  | $ | (10 | ) |  |  | $ | (7,706 | ) |  |  | $ | (7,716 | )
Other comprehensive income (loss) before reclassifications |  |  | 849 |  |  |  |  | (1,954 | ) |  |  |  | (1,105 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | (27 | ) |  |  |  | - |  |  |  |  | (27 | )
Other comprehensive income (loss) |  |  | 822 |  |  |  |  | (1,954 | ) |  |  |  | (1,132 | )
Balance as of March 31, 2020 |  | $ | 812 |  |  |  | $ | (9,660 | ) |  |  | $ | (8,848 | )

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